arch/sh/mm/cache-shx3.c

Source file repositories/reference/linux-study-clean/arch/sh/mm/cache-shx3.c

File Facts

System
Linux kernel
Corpus path
arch/sh/mm/cache-shx3.c
Extension
.c
Size
1054 bytes
Lines
46
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <asm/cache.h>
#include <asm/cacheflush.h>

#define CCR_CACHE_SNM	0x40000		/* Hardware-assisted synonym avoidance */
#define CCR_CACHE_IBE	0x1000000	/* ICBI broadcast */

void __init shx3_cache_init(void)
{
	unsigned int ccr;

	ccr = __raw_readl(SH_CCR);

	/*
	 * If we've got cache aliases, resolve them in hardware.
	 */
	if (boot_cpu_data.dcache.n_aliases || boot_cpu_data.icache.n_aliases) {
		ccr |= CCR_CACHE_SNM;

		boot_cpu_data.icache.n_aliases = 0;
		boot_cpu_data.dcache.n_aliases = 0;

		pr_info("Enabling hardware synonym avoidance\n");
	}

#ifdef CONFIG_SMP
	/*
	 * Broadcast I-cache block invalidations by default.
	 */
	ccr |= CCR_CACHE_IBE;
#endif

	writel_uncached(ccr, SH_CCR);
}

Annotation

Implementation Notes